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Table 2.

Prediction of salivary cotinine for usual brand smoking at trial 1 (n= 53)

MeasureSemipartial correlationSignificance (P)R2
CPD 0.21 0.102 0.12 
CPD × yield 0.25 0.055 0.14 
CPD × yield × intake 0.54 <0.001 0.36 
CPD × intake elasticity 0.61 <0.001 0.41 
MeasureSemipartial correlationSignificance (P)R2
CPD 0.21 0.102 0.12 
CPD × yield 0.25 0.055 0.14 
CPD × yield × intake 0.54 <0.001 0.36 
CPD × intake elasticity 0.61 <0.001 0.41 

NOTE: Linear regression, adjusting for time of saliva collection and gender.

Abbreviation: CPD, cigarettes per day.

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